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1 | ///////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // (C) Copyright Ion Gaztanaga 2006-2013 | |
4 | // | |
5 | // Distributed under the Boost Software License, Version 1.0. | |
6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | // | |
9 | // See http://www.boost.org/libs/intrusive for documentation. | |
10 | // | |
11 | ///////////////////////////////////////////////////////////////////////////// | |
12 | ||
13 | #ifndef BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP | |
14 | #define BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP | |
15 | ||
16 | #include <boost/intrusive/detail/config_begin.hpp> | |
17 | #include <boost/intrusive/intrusive_fwd.hpp> | |
18 | #include <boost/intrusive/link_mode.hpp> | |
19 | #include <boost/intrusive/pointer_traits.hpp> | |
20 | ||
21 | #if defined(BOOST_HAS_PRAGMA_ONCE) | |
22 | # pragma once | |
23 | #endif | |
24 | ||
25 | namespace boost { | |
26 | namespace intrusive { | |
27 | ||
28 | //!This value traits template is used to create value traits | |
29 | //!from user defined node traits where value_traits::value_type will | |
30 | //!derive from node_traits::node | |
31 | ||
32 | template<class T, class NodeTraits, link_mode_type LinkMode | |
33 | #ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED | |
34 | = safe_link | |
35 | #endif | |
36 | > | |
37 | struct derivation_value_traits | |
38 | { | |
39 | public: | |
40 | typedef NodeTraits node_traits; | |
41 | typedef T value_type; | |
42 | typedef typename node_traits::node node; | |
43 | typedef typename node_traits::node_ptr node_ptr; | |
44 | typedef typename node_traits::const_node_ptr const_node_ptr; | |
45 | typedef typename pointer_traits<node_ptr>:: | |
46 | template rebind_pointer<value_type>::type pointer; | |
47 | typedef typename pointer_traits<node_ptr>:: | |
48 | template rebind_pointer<const value_type>::type const_pointer; | |
49 | typedef typename boost::intrusive:: | |
50 | pointer_traits<pointer>::reference reference; | |
51 | typedef typename boost::intrusive:: | |
52 | pointer_traits<const_pointer>::reference const_reference; | |
53 | static const link_mode_type link_mode = LinkMode; | |
54 | ||
55 | static node_ptr to_node_ptr(reference value) | |
56 | { return node_ptr(&value); } | |
57 | ||
58 | static const_node_ptr to_node_ptr(const_reference value) | |
59 | { return node_ptr(&value); } | |
60 | ||
61 | static pointer to_value_ptr(const node_ptr &n) | |
62 | { | |
63 | return pointer_traits<pointer>::pointer_to(static_cast<reference>(*n)); | |
64 | } | |
65 | ||
66 | static const_pointer to_value_ptr(const const_node_ptr &n) | |
67 | { | |
68 | return pointer_traits<pointer>::pointer_to(static_cast<const_reference>(*n)); | |
69 | } | |
70 | }; | |
71 | ||
72 | } //namespace intrusive | |
73 | } //namespace boost | |
74 | ||
75 | #include <boost/intrusive/detail/config_end.hpp> | |
76 | ||
77 | #endif //BOOST_INTRUSIVE_DERIVATION_VALUE_TRAITS_HPP |